When you exclude pending appeals (that will inevitably fail), areas where the overturn has occurred but is pending (FL & WY), and states in districts where the bans have been ruled unconstitutional but the states have not yet been forced to recognize it (SC, KS, MT), there are only 10 states left to fall, which comprise barely 15% of the US population.
Imagine that. 
Damn, MO, hurry up so we can have contiguous coast-to-coast SSM coverage!
Since Ohio is the biggest state with no appeal yet, it's good to explain why.
The Ohio court, seeing than the Michigan case was already in front of the circuit court, decided to wait the verdict of the circuit court before doing anything else about it.
